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Transport Properties and Magnetism of β-MnO2

Published online by Cambridge University Press:  10 February 2011

H. Sato
Affiliation:
Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan hirohiko@chem.titech.ac.jp
T. Enoki
Affiliation:
Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan hirohiko@chem.titech.ac.jp
K. Wakiya
Affiliation:
Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan hirohiko@chem.titech.ac.jp
M. Isobe
Affiliation:
Institute for Solid State Physics, the University of Tokyo, Minato-ku, Tokyo 106-8666, Japan
Y. Ueda
Affiliation:
Institute for Solid State Physics, the University of Tokyo, Minato-ku, Tokyo 106-8666, Japan
T. Kiyama
Affiliation:
Photon Factory (PF), Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
Y. Wakabayashi
Affiliation:
Photon Factory (PF), Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan Department of Physics, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan
H. Nakao
Affiliation:
Photon Factory (PF), Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
Y. Murakami
Affiliation:
Photon Factory (PF), Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
Corresponding
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Abstract

A comprehensive study of transport properties and magnetism on β-MnO2 reveals the strong coupling between the conduction electrons and the localized spins which are supposed to form a magnetic helix below TN ∼ 92 K. We also show the direct evidences of the helical magnetism by means of the measurements of the anisotropy in the magnetic susceptibility and the observation of x ray magnetic scatterings on a single crystal of β-MnO2. These results are consistent with proper-type helix model proposed by Yoshimori [J. Phys. Soc. Jpn. 14, p. 807 (1959)]. This model also qualitatively agrees with the anisotropy in magnetoresistance that appears below T N. The pitch of the magnetic helix is not commensurate to the lattice and it is slightly temperature dependent. The intensity of several Bragg peaks drastically changes at T N suggesting that the magnetic ordering is accompanied by a lattice distortion.

Type
Research Article
Copyright
Copyright © Materials Research Society 2000

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References

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